The present perfect is a tense used to express  completed actions which have occurred in the past, are connected to the  present and still have effects on it.
When expressed in its negative form, the verb denies something about the subject.
<a href="https://open.books4languages.com/english-a2-grammar/chapter/present-perfect-negative/">https://open.books4languages.com/english-a2-grammar/chapter/present-perfect-negative/</a>

The present perfect is a tense used to express completed actions which have occurred in the past, are connected to the present and still have effects on it. When expressed in its negative form, the verb denies something about the subject. https://open.books4languages.com/english-a2-grammar/chapter/present-perfect-negative/

The present perfect is a tense used to express &nbsp;completed actions which have&nbsp;occurred in the past, are connected to&nbsp;the &nbsp;present and still have effects on it.
When expressed in its negative form, the verb denies&nbsp;something about the subject.
<a href="https://open.books4languages.com/english-a2-grammar/chapter/present-perfect-negative/" rel="noopener noreferrer">https://open.books4languages.com/english-a2-grammar/chapter/present-perfect-negative/</a>

Present Perfect Negative

Open Educational Resources for Teaching and Learning English as Second Language which can be reused, modified, and shared and that provide unconstrained materials for the benefit and the enjoyment of others.

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Open Educational Resources for Teaching and Learning English as Second Language which can be reused, modified, and shared and that provide unconstrained materials for the benefit and the enjoyment of others. https://books4languages.com

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Present Perfect Negative

Present Perfect Negative